中文摘要：

在静止条件下汽泡脱离直径预测模型的基础上，引入摇摆条件引起的瞬变外力场，构建了摇摆条件下汽泡脱离直径预测模型，通过实验数据进行验证，结果符合较好。通过受力分析发现，摇摆运动引起的浮力波动必须予以考虑。模型计算发现：角位移θ＝0°时，汽泡脱离直径最小；而质量流速越大，这种趋势越不明显。如果系统存在5％以上的流量波动，则其对汽泡脱离直径的影响必须加以考虑。

英文摘要：

Based on force balance analysis under static condition , a bubble departure model was established to predict the bubble departure size under rolling condition by considering the additional force .The proposed model agrees well with the experimental data .By force analysis it is indicated that the buoyancy fluctuation caused by rolling motion must be considered in the model .The calculation result shows that the bubble departure diameter is the minimum w hen the angular displacement is zero .T his tenden-cy is more unobvious with the increase of mass flow rate .Moreover ,if the experiment loop has more than 5% of the flow fluctuation , the influence of flow fluctuation on bubble departure diameter must be considered .